Tactile sense presentation device, electronic apparatus, and method of driving tactile sense presentation device

Abstract

A tactile sense presentation device includes a panel that includes a support substrate, a plurality of electrodes, which are formed on the support substrate, extending in a predetermined direction, and an insulating layer covering the plurality of electrodes; and a drive unit that drives the panel, wherein a tactile sense is presented to an operator based on an electrostatic force generated between the electrodes and the operator by the drive unit applying a signal of a voltage to the electrode, a contact face of the insulating layer that is in contact with the operator has a surface roughness Ra of a predetermined range, and the voltage applied to the electrodes corresponding to an area in which the tactile sense is presented to the operator is a voltage corresponding to the surface roughness Ra of the contact face.

What is claimed is: 
     
       1. An electrostatic tactile display comprising:
 a panel that includes a support substrate, an electrode formed on the support substrate, and an insulating layer covering the electrode; and 
 a drive unit that drives the panel, 
 wherein a tactile sense is presented to an operator by the drive unit applying a signal of a voltage with a predetermined frequency to the electrode, by an electrostatic force generated between the electrode and the operator changing according to the predetermined frequency, and by a frictional force between the operator and a contact face of the insulating layer that is in contact with the operator changing, 
 wherein static irregularities are formed on the contact face, 
 wherein an arithmetic average roughness of the contact face due to the irregularities is a fixed value within a predetermined range which is larger than 0.01 μm and smaller than 0.8 μm, and 
 wherein the arithmetic average roughness is acquired by folding a roughness curve at the center line and by dividing an area acquired by the folded roughness curve and the center line by a length of the center line. 
 
     
     
       2. The electrostatic tactile display according to  claim 1 ,
 wherein the predetermined range is a range in which the arithmetic average roughness is larger than 0.03 μm and smaller than 0.8 μm. 
 
     
     
       3. The electrostatic tactile display according to  claim 1 ,
 wherein the arithmetic average roughness of the contact face is the arithmetic average roughness when a detection threshold voltage for which the operator can perceive the tactile sense is lower than the detection threshold voltage when the arithmetic average roughness is 0.00 μm, and 
 wherein the detection threshold voltage is a lowest voltage at which the operator can perceive the tactile sense when the arithmetic average roughness of the surface is fixed and the voltage applied to the electrode is changed. 
 
     
     
       4. The electrostatic tactile display according to  claim 1 ,
 wherein the drive unit applies the signal of the voltage with an amplitude corresponding to the arithmetic average roughness of the contact face to the electrode.